Abstract
Crystals are known to affect bubble behavior in natural and industrial melts. In volcanology, high crystal contents (phi(c) > 30 vol.%) may drastically increase the suspension viscosity, altering bubble dynamics severely enough to modify eruptive style. During industrial glass production, crystals can affect the process and the final product. In this work, we investigate how a small crystallinity of nano-sized RuO2 (phi(c) similar to 2 vol.%) modifies bubble behavior in a melt, generating a cyclic gas-release phenomenon. We conduct a series of experiments on a three-phase system composed of a borosilicate melt, bubbles, and RuO2 crystals. Optical microscopic investigation is performed on the products of thermal treatment at 1000 degrees C for different durations. Based on viscosity measurements, contact angle measurements, and numerical simulations, we propose a mechanism of entrainment of bubbles carrying crystals to the upper surface accompanied by crystal aggregation, and followed by an increase in viscosity to explain the observed phenomenon.
Item Type: | Journal article |
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Faculties: | Geosciences > Department of Earth and Environmental Sciences |
Subjects: | 500 Science > 550 Earth sciences and geology |
ISSN: | 0022-3093 |
Language: | English |
Item ID: | 110670 |
Date Deposited: | 02. Apr 2024, 07:19 |
Last Modified: | 02. Apr 2024, 07:19 |